Climate change is melting glaciers1, reducing sea-ice cover and increasing wildlife activity - with some of the most dramatic impacts occurring in the northern high latitudes2. New research by University of Montana affiliate3 scientist Adam Young and UM fire ecology Associate Professor Philip Higuera projects an increased probability of fires occurring in Alaskan boreal forest and tundra4 under a warmer, drier climate. Their work recently was published in the journal Ecography.The paper titled Climatic thresholds shape northern high-latitude fire regimes and imply vulnerability to future climate change is available online at http://onlinelibrary.wiley.com/doi/10.1111/ecog.02205/abstract.Young, also a doctoral candidate at the University of Idaho, projects that by the end of this century the probability of burning in many high-latitude ecosplayystems5 in Alaska will be up to four times higher than seen in recent decades. Tundra and the forest-tundra boundary, which have not burned often in the past, are particularly sensitive to projected changes in temperature and moisture. We looked at the location of wildfires across Alaska during the past 60 years and, not surprisingly, found that they were most common in regions with warm, dry summers, Young said. The more interesting result of our work is the emergence6 of a distinct temperature threshold that separates areas that have and have not burned in recent decades. Above this threshold, we see a sharp increase in the likelihood that a fire will occur in a region.The research highlights that regions crossing this temperature threshold as a result of climate change are the most vulnerable to increased burning.
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1 glaciers 冰河，冰川 参考例句： Glaciers gouged out valleys from the hills. 冰川把丘陵地带冲出一条条山谷。 It has ice and snow glaciers, rainforests and beautiful mountains. 既有冰川，又有雨林和秀丽的山峰。 来自英语晨读30分（高中一年级）
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